augustoasilva commented on a change in pull request #11551:
URL: https://github.com/apache/arrow/pull/11551#discussion_r755009301
##########
File path: cpp/src/gandiva/gdv_function_stubs.cc
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@@ -794,6 +812,188 @@ const char* gdv_fn_initcap_utf8(int64_t context, const
char* data, int32_t data_
*out_len = out_idx;
return out;
}
+
+GANDIVA_EXPORT
+const char* gdv_mask_first_n_utf8_int32(int64_t context, const char* data,
+ int32_t data_len, int32_t n_to_mask,
+ int32_t* out_len) {
+ if (data_len <= 0) {
+ *out_len = 0;
+ return nullptr;
+ }
+
+ *out_len = data_len;
+
+ char* out = reinterpret_cast<char*>(gdv_fn_context_arena_malloc(context,
*out_len));
+ if (out == nullptr) {
+ gdv_fn_context_set_error_msg(context, "Could not allocate memory for
output string");
+ *out_len = 0;
+ return nullptr;
+ }
+
+ if (n_to_mask < 0) {
+ memcpy(out, data, data_len);
+ return out;
+ }
+
+ int num_masked;
+ for (num_masked = 0; num_masked < n_to_mask; num_masked++) {
+ unsigned char char_single_byte = data[num_masked];
+ if (char_single_byte > 127) {
+ // found a multi-byte utf-8 char
+ break;
+ }
+ out[num_masked] = mask_array[char_single_byte];
+ }
+
+ utf8proc_int32_t utf8_char;
+ int char_counter = num_masked;
Review comment:
The condition for while loop cant be (num_masked < n_to_mask) because
num_masked counts bytes masked till now, not exactly the number of chars. Eg.:
if the char 'รง' has been masked, the num_masked will be increased by 2, as this
char has 2 bytes. The char counters is the real counter for the characters
masked. it will have the initial value of num_masked because until a char
bigger than 127 is found, each char has the size of 1 byte.
But I will think of a better naming for it
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